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In computing, format is a command-line utility that carries out disk formatting. It is a component of various operating systems , including 86-DOS , MS-DOS , IBM PC DOS and OS/2 , Microsoft Windows and ReactOS .
A block, a contiguous number of bytes, is the minimum unit of storage that is read from and written to a disk by a disk driver.The earliest disk drives had fixed block sizes (e.g. the IBM 350 disk storage unit (of the late 1950s) block size was 100 six-bit characters) but starting with the 1301 [8] IBM marketed subsystems that featured variable block sizes: a particular track could have blocks ...
Specifically, the above will create a 2 GB logical partition, provided that adequate space is available, and assign it the drive letter 'F:'. [5] The installed disks and their associated volumes and/or partitions can be viewed using these commands: list disk list volume list partition The sel command will select them.
The JOIN command attaches a drive letter to a specified directory on another drive. [11] The opposite can be achieved via the SUBST command. The command is available in MS-DOS versions 3 through 5. It is available separately for versions 6.2 and later on the Supplemental Disk. [1]
Z: — First network drive if using Banyan VINES, and the initial drive letter assignment for the virtual disk network in the DOSBox x86 emulator. It is also the first letter selected by Windows for network resources, as it automatically selects from Z: downwards. By default, Wine maps Z: to the root of the UNIX directory tree. [10]
dd is a command-line utility for Unix, Plan 9, Inferno, and Unix-like operating systems and beyond, the primary purpose of which is to convert and copy files. [1] On Unix, device drivers for hardware (such as hard disk drives) and special device files (such as /dev/zero and /dev/random) appear in the file system just like normal files; dd can also read and/or write from/to these files ...
The command is also available in FreeDOS [5] and PTS-DOS. [6] The Windows SUBST command is available in supported versions of the command line interpreter cmd.exe. [7] In Windows NT, SUBST uses DefineDosDevice() to create the disk mappings. The JOIN command is the "opposite" of SUBST, because JOIN will take a drive letter and make it appear as ...
Universal Disk Format (UDF) is an open, vendor-neutral file system for computer data storage for a broad range of media. In practice, it has been most widely used for DVDs and newer optical disc formats, supplanting ISO 9660 .